Master readme update

[drizuid]

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• I have read the contributing guideline and understand that I have made the correct modifications

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Description:

our current instructions for Unifi routers are lacking and cause a loss of functionality if followed. This provides more detail.

Benefits of this PR and context:

provide more detail to allow users to have a fully working solution

How Has This Been Tested?

N/A
ref: #53

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/netbootxyz/0.6.9-pkg-f725b990-dev-352fd78ae88335aea0119d6dd8b79622d1b0617b-pr-52/index.html
https://ci-tests.linuxserver.io/lspipepr/netbootxyz/0.6.9-pkg-f725b990-dev-352fd78ae88335aea0119d6dd8b79622d1b0617b-pr-52/shellcheck-result.xml

Tag	Passed
amd64-0.6.9-pkg-f725b990-dev-352fd78ae88335aea0119d6dd8b79622d1b0617b-pr-52	✅
arm64v8-0.6.9-pkg-f725b990-dev-352fd78ae88335aea0119d6dd8b79622d1b0617b-pr-52	✅

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/netbootxyz/0.6.9-pkg-f725b990-dev-04e74d231d39ae3511f2995e4d65fa96cd43daa4-pr-52/index.html
https://ci-tests.linuxserver.io/lspipepr/netbootxyz/0.6.9-pkg-f725b990-dev-04e74d231d39ae3511f2995e4d65fa96cd43daa4-pr-52/shellcheck-result.xml

Tag	Passed
amd64-0.6.9-pkg-f725b990-dev-04e74d231d39ae3511f2995e4d65fa96cd43daa4-pr-52	✅
arm64v8-0.6.9-pkg-f725b990-dev-04e74d231d39ae3511f2995e4d65fa96cd43daa4-pr-52	✅

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/netbootxyz/0.6.9-pkg-f725b990-dev-53ad17456bc63d4c4c12d7f145eda4855f0f2875-pr-52/index.html
https://ci-tests.linuxserver.io/lspipepr/netbootxyz/0.6.9-pkg-f725b990-dev-53ad17456bc63d4c4c12d7f145eda4855f0f2875-pr-52/shellcheck-result.xml

Tag	Passed
amd64-0.6.9-pkg-f725b990-dev-53ad17456bc63d4c4c12d7f145eda4855f0f2875-pr-52	✅
arm64v8-0.6.9-pkg-f725b990-dev-53ad17456bc63d4c4c12d7f145eda4855f0f2875-pr-52	✅